Ladder



E. mecum.

l LADDER. APPLICAUON FILED M M. l5. l920,

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E. NICCUM.

LADDER.

APPLICATION FILED MAR.- l5. 192D.

Patented Dec. 27, 19.21. D

3 SHEETS-QHEET 2,

E. NIGCUM.

LADDER,

,'IIILICATIUII` FILED MMI. I5. |920.

1111911161 Deu. 27, 1921.y

3 SHEETS-SHEET 3.

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UNITED STATES PATENT OFFICE.

nrmswoncrrr mecum, or KENT, WASHINGTON.

LADDER.

Speuication of Letters Patient.

Patented Dec. 27, 1921.

Application inea trafen 15, 1920. serial No. 366,002.'

bodies improved features applicable to both extension and non-extension ladders.

It is my purpose to provide an improved construction for use `in connection with extension ladders embodying a lower section and an upper movable section, which will automatically operate as the upper section is elevated to secure the same against descent, and which Vis manually releasable at will to permit descent of the upper section of the ladder. y

A further'purpose of my invention is to provide an improved adjustable prop base for use in connection with either extension or non-extension ladders. j

With the above and `other purposes in view my invention consists in the details of construction `and in the arrangement and combination of parts to be `hereinafter more particularly pointed Aout in the claims.

In describing my invention in detail reterence will be had to the accompanying drawings wherein like characters `of refer ence denote corresponding parts in the several views, and inwhich j Fi re 1 is a front elevation of an extension adder constructed in accordance with myTinvention j j ig. 2, a side `view of same;

Fig. 3, a partial vertical sectionof the ladder showing the paw] carriedy bythe upper movable section and which automatically engages the rungs of the lower section to secure the upper movable section against descent; j

Fi 4, a perspective view of the connec tion between the props of the lower section and the upper movable section which permits adjustment of the rops in harmony with the adjustment of the ladder sections;

Fig. 5, a detail elevation of the adjustable ladder embodying the adjustable prop base in a slightly modified form;

Fig. 8,11. detail elevation of the prop base shown in Fig. 7; and

Fig. 9, a section on the line 9-j-9 of Fig. S.

Referring to Figs. 1 to (i inclusive of the drawings my improved ladder is shown as comprising a lower section A and an upper movable section B. The section A includes side members 10 and 11 connected by the usual rungs 12 and strengthened by tie rods 13 disposed directly beneath the rungs. Likewise the section B is formed of side members 14 and 15 connected by the usual rungs 16 and strengthened by tie rods 17 disposed directly beneath the rungs. The sections A and B are slidably secured together by means of keepers 18 and 19 secured respectively to the sections A and B. Secured to the lower ends of the side members 10 and 11 of the section A respectively are outwardly and downwardly inclined base beams 20 and these base beams are in turn connected with `the side members 10 and 11 respectively adjacent the upper ends of the latter by means of braces 21. To secure the member B at a desired elevation with respect to the member A I pivotally mount on one oit the tie rods 17 a U-shaped pawl 22 which, when the ladder is inclined to any extent, will swing to a position to overlie one of the rungs 12 of the prop A and in this way prevent descent of the member B. As the ladder member is elevated it willbe apparent that the pawl 22 will ratchet over the rungs 12 `and as it passes each rung it will swing to a position to engage the next lower rung 12 on the member A. This pawl 22 is provided with a handle 23 whereby it may be swung out of overlying relation with the related rung 12 to permit descent ofthe upper section B. This handle also serves as a stop to limit inward movement of the pawl, said handle engaging a rung of the section B for that pur- Ose. p The section A of the ladder has pivoted thereto a prop C formed of members 24 and 25 converging downwardly and connected at their' lower ends by a spacing block 26. Secured to the front and rear of this spacing block 26 are plates 27 between the lower ends of which I pivotally mount a prop base 28. Secured to this base is an arcuate segment 29 provided with notches 30 in which is adapted to be engaged and disengaged a pawl 31 pivoted to the prop member 24 and O l. :D in proper relation to trie prop incnibers .2l and 25 by e. guide l nzzed on the prop member 25 and haring e. notch 36 i Wliicli the arcuate seelnent is enfnffed enc travels during pivotal prop bese 28.

.It Will .be observed that when the prop base 28 is used the bose beams .40 be pensed with :is the bese Will iinpelt ample stability to the ladder; @n the otlier nur.. if deSireCLtlie prop bese can be dispensed with tnid tlie base beams 2O retfined with still imple stability present for fe or the ladder. lt is believed desirable.y -liowever, t0 employ both of these elements in tlie ladder `construction t@ secure tlie -reetest stability. especially in ceses where tli ladder is extended to greet heights.

Pivotelly secured to the upper vsection B is e prop 37 which carries its lower end member 38 slidebly and noirdetecliebljfv enraged with the prop members 24 and 25. Thisconstrnction, it will be olwions. will permit adjustment of tbe prop 37 in hermony with adjustment of the inenber E of the ladder. The prop member Si? also ries et its lower end e toothed plate 39 with rliicii cooperates e pewl l0 in the torni ol" e bail and i lrotelly connected to tlie prop members 24 end 25. The eopersti-on or" this pewl l0 with the teeth el: the plete 39 is effected by gravity and in order to disengege the pand-40 from the plete 39 When desired I provide on seid pewl en erin ll to which is secured e. iexible connection 42, the letter being adapted to be carried to ani: desired point Where it niey be convenientlyT pulled to disengege the pewl Ll() from tbe plate 89 and thus permit descent or" the prop 3"?. ln other Words any tendency of tlie prop 37 to descend lis prevented by engagement ot the pewl 40 with tlie tooth plate 39 end any tendency of thel section B of tbe ladder to descend is prevented by tlie pewl 22 engaging one of the rungs l2 of the sect-ion i ci the ladder.

In F 7 to 9 l lieve shown nij; improved rop bese associated with a. non-extensible adder embodying e ladder roem er D and prop E pivoted thereto. The lfm'er end of the prop E has secured to its inner and outer 'laces platesl i3 between which is pivoted the prop base lle. This base also carries e notched segment which is guided in its lWhile I lieve illustrated :inl :l/frribc-l one forni ot cerryinggf ini' invention into rnction practice it will be obri' ic orrz'ingjement und combinntion ol iuris can be resorted to without dcprntingg 'roin the scope of tlie im'enl'ion :is lol/:lli in the appended claims.

What l claim is:

In en extension lziddery tlie conibiinition of upper e d lower .ladder sections, props pivotfilli7 connected to seid stations respectivelyv and having slirlzible ccnnecion with each other, and menne for scenrici be prop of the upper section .ffgrzxinst sliding.; inoif'enient doWnWerdljfv *with respect to ile prop of the lower section.

2. In :1n extension lntdderY tbc tion or upperI und lower bilder se@ .1' prop piifotelly connected on tbe l tion, e prop pirotelljf connected upper section, L member carried prop of tlie upper section :ind slidnbljs engagged vwith the prop of tbe lower ffwtion, nml detachable lzitcliing ineens for bling; tbe prop of the Upper section ngeinst movement downwardly with respect to tbc prop of the lower section.

3. In :in extension ladder. lille combina.- tion or upper and lower ladder sections, :L prop pivote-liv connected on tbc lmvcr eef tion. o prop piiiotell).7 connected on tlie upper section, a member on the prop o? tbc upper section slidebl).y engaged with the prop c? the lower section. n. tooth ineniber cerried br the prop ot tlie upper section. :ind P pnwl pivoted on tlie prop oi tbc lever :fectioi deterlisbl engegefiblc ritli the 'vitli mi ber liold the prop ot npjjier rfc@ .I f et more lent doiy itl. rc1-e to tire prop oit the lon' n 'testimony Wliereol f I in the presence of two wi is.

netsw(nrrn' N if: on r, 1.

lllitnesscs: A

H. B. MADISON, Forensi' D. Nicolin.

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